When specifying high-current terminal posts for critical energy storage or electric vehicle applications, the manufacturing quality of the component directly impacts system safety, reliability, and lifespan. Unlike generic off-the-shelf terminals, professionally manufactured power studs undergo strict material selection, precision molding, and rigorous quality control.
This article takes you inside LYD’s manufacturing process for our IP67 waterproof rectangular terminal post series (120A to 400A) and explains what separates industrial-grade components from commodity parts.
Material Selection — The Foundation of Quality
Conductor: High-Purity Copper with Nickel Plating
LYD uses only high-purity electrolytic copper (≥99.9% Cu) for the current-carrying conductor. The copper is then nickel-plated in a controlled bath process to achieve uniform coating thickness. Nickel plating provides:
- Corrosion resistance in humid and salt-spray environments
- Low contact resistance that remains stable over time
- Wear resistance for repeated connection cycles
Housing: PA66 Nylon with UL94 V-0 Rating
The housing is injection-molded from virgin Polyamide 66 (PA66) compounded with UL94 V-0 flame retardant additives. Key quality indicators:
- Virgin material only — no regrind or recycled content that could compromise mechanical strength
- Controlled molding parameters — temperature, pressure, and cooling cycles are monitored for consistency
- Dimensional verification — each mold cavity is CMM-inspected at regular intervals
Manufacturing Process Overview
- Copper Stamping/Machining: Conductors are stamped or CNC-machined from copper stock, then deburred and cleaned.
- Nickel Plating: Parts undergo electrolytic nickel plating in a controlled bath with thickness verification.
- Injection Molding: PA66 housing is molded around the conductor insert in a single operation.
- Silicone O-Ring Assembly: Precision silicone O-rings are installed in the sealing groove.
- Assembly: Mounting hardware (nuts, washers) are kitted with the terminal post.
- 100% Visual Inspection: Each unit is checked for plating defects, molding flash, and O-ring integrity.
- Sample Testing: Random samples from each batch undergo IP67 immersion, dielectric strength, and torque testing.
Quality Control Standards
| Test | Standard | Frequency |
|---|---|---|
| IP67 Immersion | IEC 60529 — 1m, 30 min | Per batch sample |
| Dielectric Strength | AC 2000V for 1 minute | Per batch sample |
| Contact Resistance | ≤ 0.5 mΩ (mated pair) | Per batch sample |
| Salt Spray | ASTM B117 — 72 hours | Quarterly |
| Torque Retention | Mounting nut: spec ±10% | Per batch sample |
OEM Customization Options
LYD supports full B2B customization for volume orders:
| Customization | Options |
|---|---|
| Current Rating | 120A to 400A (custom ratings available) |
| Terminal Type | A-Type (busbar), C-Type (cable lug) |
| Plating | Nickel (standard), Tin, Silver (on request) |
| Color Coding | Red/Black (standard), custom colors |
| Packaging | Bulk, paired sets, or individual blister packs |
| Labeling | Custom laser marking or label |
Why LYD for OEM Supply?
- 17+ years of connector manufacturing experience
- UL / RoHS / REACH compliant production
- ISO 9001 quality management system
- Low MOQ for standard models
- Fast lead times: 5-7 business days for standard products
For OEM inquiries and bulk pricing, contact nick.xu@lyd123.com.
